This is one of the most popular search questions about sustainability on the Web.
Globally there are over one million/month searches with 450,000 of them from the United States. There is no one definition although a popular one cited is the Brundtland Commission of the United Nations of March 20, 1987: “sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs.” As Wikipedia reports, "At the 2005 World Summit it was noted that this requires the reconciliation of environmental, social and economic demands - the "three pillars" of sustainability. Here on EarthSayers 
we express these three pillars as planet, people, and prosperity. We created a taxonomy or content map for the concept which you can use to find information and better understand the concept.

Curated by mokiethecat
Sustainability 101: Exponential Growth by Dr. Albert Bartlett |
Professor Bartlett explains "sustainability" in the context of the First Law of Sustainability. Problems at local, national, and global levels are all tied together with arithmetic. And our greatest shortcoming is our inability to understand the exponential function. Dr. Albert Bartlett discusses the implications of unending growth on economies, population, and resources. Presented at UBC on 5/19/2011. For more information, see http://www.AlBartlett.org . EarthSayer Albert Bartlett |

Consumer Awareness of Sustainability by People 4 Earth

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Waking Up to Sustainability by John Elkington

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Just Imagine: Sustainability CNN Interview of Majora Carter

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The Natural Step and Sustainability Explained in Two Minutes

Definition of Sustainable Innovation, Elementary Style by Dassault Systems

Sustainability Has Many Definitions by Stuart Hart

Definition of Sustainability by Corporations by Christoph Lueneburger

Defining Sustainability - Business Insights by Dr. Karl-Henrick Robert

Being Frugal: The Original Sustainability?

To Hell with Sustainability by Colin Beavan